What Makes the IS200EXHSG3AEC a "High-Speed" Exciter Board

The IS200EXHSG3AEC is a High-Speed Static Exciter Terminal Board built for GE's EX2100 excitation control platform, the static exciter system that runs alongside Mark VI or Mark VIe turbine control on a generator set. The "high-speed" in its name refers to how it's built, not just what it does: this board is essentially a duplicate of GE's standard EXTB terminal board, but redesigned for high-current applications by using solid-state relay drivers on its DC contactor outputs instead of conventional electromechanical relay drivers, paired with a high-speed contactor for protection duty in higher-current circuits. On the excitation side, it handles pilot relay contact outputs, contact inputs, and signal conditioning, and it distributes signals to the exciter's main I/O board (EMIO) through its P1/P2 backplane connectors.

Despite the IS200 prefix it shares with Mark VI turbine control boards, this is not a VME card — it has no metal installation faceplate and does not mount in a VME rack. It's a terminal board, built with three D-shell cable connectors along its front edge, eight plug connectors, fifteen integrated circuits, seven relays, a heat sink, and a mix of electrolytic, ceramic, and polyester-vinyl capacitors. It shows up in Mark VI IS200 catalogs because EX2100 excitation systems are almost always installed and stocked alongside the Mark VI turbine controller on the same unit.

What to Check Before You Condemn This Board

A nuisance exciter trip, a failed field-flash sequence, or a relay-driver alarm doesn't automatically mean the EXHS board itself has failed. Work through these first:

• Test the contactor and its coil circuit. Since this board's whole design purpose is driving a high-current DC contactor, a mechanical contactor problem, a blown fuse, or a broken wire to the contactor coil can produce the exact same trip or fault indication as a bad relay driver on the board.
• Check relay status and LEDs against the wiring, not just the alarm text. Confirming whether the fault is on the control-logic side or the field-wiring side narrows down whether you actually need this board.
• Don't assume every EXHS-family fault stays local to this board. Because it distributes signals to the EMIO board over P1/P2, a problem reported at the exciter regulator level can originate in that connection or in the EMIO board itself.
• Verify you're not dealing with an EXTB/EXHS mix-up. The two boards look and function similarly, but the EXHS's solid-state relay drivers are specifically there for higher-current duty — don't substitute one for the other without confirming which one your application actually calls for.

Once the contactor, wiring, and EMIO connection check out clean, ordering this board is the right move.

Reading the IS200EXHSG3AEC Part Number

IS200 is the platform prefix, EXHS is the four-letter function code, and G3AEC identifies the group and revision — G3A for the group, EC for the specific revision. GE uses the G-prefix here the way it uses H-prefixes on other IS200 boards, so treat G3A as this board's generation marker and match the complete string when sourcing a replacement. Our GE Speedtronic Part Number Decoder explains how to work through a full IS200 part number.

Related Boards

The closest relative to this board is the standard IS200EXTB terminal board, which handles the same basic function at standard current ratings without the solid-state relay drivers. On the rack side, this board talks to the EMIO (EX2100 Main I/O) board over its P1/P2 connectors. If you're also tracking older Mark IV/Mark V equipment, see our Mark V vs Mark VI: DS200 to IS200 guide and GE Mark V DS200 Boards Explained article. Browse the rest of the family in our GE Mark VI IS200 Boards collection or the wider GE Speedtronic Turbine Control Boards collection.

What to Include in Your Quote Request

• Full part number with suffix: IS200EXHSG3AEC
• Revision from the physical label
• Photo of the board's ID label
• Exciter/turbine model and unit ID
• Planned outage or urgent/unplanned need
• Quantity required

Request a Quote

This IS200EXHSG3AEC is listed in used condition, clean and tested, with a 1-year warranty (see table below). We quote every order directly rather than publishing prices — submit a Request a Quote and expect a reply within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned outages and urgent breakdown needs.

General Information about the Product
Part Number	IS200EXHSG3A Mark VI IS200
Description	GE General Electric IS200EXHSG3A IS200EXHSG3AEC Static Exciter High-Speed Terminal Board Mark VI
Condition	used Clean and Tested. With 1 Year Warranty.